Grass-cutting machine



Nov. 22, 1927.

H. A. T. STOAKES GRASS CUTTING MACHINE Filgd July 1, 1925 2 Sheets-Sheet l Nov. 22, 1927. 1,649,868

- H. A. T ..STOAKES- GRASS CUTTING MACHINE Filed July-l, 1925 2 Sheets-Sheet 2 Patented Nov. 22, 1927.

HARRY ADRIAN. TKYLOR' STOAK'ES, or c AvEanon;nnait wartw'xcmf Eastman;

- enass-eu'rrrne ma ma;

" Application file'awui i, lezas rial No. 403.595.2114; in Great B itain: I'u1y8,;;1924.1

This invention has for itsobject to construct. an. improved. grass cutting machlne suited more particularly to the mowingof lawns, the machine being of the type in which oscillatory blades are employed.

The invention comprises the employment in conjunction with a fixed horizontal blade presenting a front cutting edgeof a plurality of T-shaped or like horizontal oscillatory blades adapted to co-operate withdifferent portions of the front edge of the fixed blade for effecting the required cutting action.

Also the invention comprises the combination and arrangement of parts hereinafter described.

In the two accompanying sheets of explanatory drawings Figure 1 is a side elevation illustrating diagrammatically a grass cutting machine constructed in accordance with this invention. .7

Figure 2 is a vertical section through the center of the machine on the line 2-2 of Fig. 3, and Figure 3 a plan to a larger scale than Figure 1 showing diagrammatically the grass cutting blades and the actuating mechanism.

Referring to the drawings, a suitable framework or body part comprises a pair of side plates at at the rear of which is mounted a spindle 19 carrying a pair of coaxial driving drums c, which run in contact with the ground and serve to impart motion to the movable blade or. blades. Transversely across the machine at its front end is arranged a fixed horizontal blade d situated near the ground. The blade may have a straight front cutting edge, or a straight cuttingedge with inclined end portions as shown, or the front cutting edge may be curved in any convenient manner.

In conjunction with the fixed blade above described are arranged a plurality of horizontal oscillatory blades 6. Each is preferably made of T-like form, the inner or rear edges of the two sides of the head serving as cutting portions and the central shank as the means by which the blade is pivoted on the machine and operated. It is convenient to make the cutting portions of the blades 6 separate from the shanks as shown in the drawings as this enables the blades to be renewed conveniently. Any suitable device may be used. for detachably securing such blades to the shanks. The shanks are pivoted on acrossbarfi. ,When moving in: I

one direction! relatively to: the: fixed=blaide the cutting is performed by the interaction of one side or edge of each oscillatory blade and the fixed blade, the other side or edge coming into action in the opposite or return movement. Each cutting edge-of the movable blade is preferably curved, and the curvature is such that the angle between the fixed and moving cutting edges radually diminishes from the initial to the nal' position thus producing a cutting action analogous to that of a shears or scissors, and also that of a scythe.

The blades 6 are connected at the outer ends of their shanks by a link 9. The said blades may be held down in contact with the fixed blade by a transverse stretcher bar h which is adjustable by screws i.

Oscillatory movements are imparted to the blades 6 through a lever j arranged between the side plates at and attached at one end to the link 9. At the other end the lever j is fastened to a pin t supported in a bracket 5 formed on a cross bar Z. The pin t carries lateral arms j arranged to co-operate with a pair of cams 70 contained within the drivextension 01 provided with a ground roller 0. It is also preferably provided with any suitable arrangement of radial vanes shown) carriedon the bearings p and rotated in any convenient manner for-sweeping the cut grass'off the blades into a box carried on the side plates a. Adjustment of the fixed blade d relatively to the ground is effected by altering the relationship between the frame plates at and the extensionn by the screws 9. Any suitable propelling or guiding handles 1" may be attached to the machine. mechanical power provision is made for attachment of a motor.

When required to be driven by- At the front of the frame ishinged an (not V The invention is not hmited to the above described means for oscillating the movable blades. Further the constructional details of the machine may be varied to suit different conditions or requirements.

Having thus described my invention what I claim as new and desire to secure by Letters Patent is I 1. In a grass cutting machine, the combination of a fixed horizontal blade presenting a front-cutting edge, a plurality of T- shaped, double acting oscillatory blades 00- operating with difierent portions of the front edge-of the fixed blade, and means for actuating the said oscillatory blades synchronously, substantially as described.

2.-In'a grass cutting machine, the combination Witha fixed horizontal blade having a substantially straight front cutting edge, 7

a plurality of oscillatory blades arranged side by side whereby during oscillation they co-act With the cutting edge throughout'its entirelength, and actuating means for the oscillatory blades.

In testimony whereof I have signed my" name to this specification.

HARRY ADRIA N TAYLOR STOAKESQ 

